<script>
    let xhr = new XMLHttpRequest();
    document.cookie = 'name=hw';
    xhr.withCredentials = true; //前端设置是否带 cookie
    xhr.open('PUT', 'http://localhost:4000/getData', true);
    xhr.setRequestHeader('name', 'hw');
    xhr.onreadystatechange = function () {
        if (xhr.readyState === 4) {
            if (xhr.status >= 200 && xhr.status < 300 || xhr.status === 304) {
                console.log(JSON.parse(xhr.response));
                console.log(xhr.getResponseHeader('name'))
            }
        }
    }
    xhr.send();
</script>